This menu provides a way to configure the context in which you expect the actions
to be displayed to the user and if you want the action to be visible or not.
You must have notice that when you view a list of entities, an action box is
available on the left column which display some actions as well as a drop-down
menu for more actions.

The context available are :

mainactions : actions listed in the left box

moreactions : actions listed in the more menu of the left box

addrelated : add actions listed in the left box

useractions : actions listed in the first section of drop-down menu
accessible from the right corner user login link

siteactions : actions listed in the second section of drop-down menu
accessible from the right corner user login link